I'm not familiar with a duAl, but I have a davis that was a three point that I converted to work on my bobcat. it will dig down 10 feet. works very good.
I can't see anything that attaches, locks in the top of that backhoe to the bobcat in your picture. Mine has arms that lock the upper mount to the machine. the tilt cylinder will not hold the attachment went you are digging.
I haven't even dug with mine since I got my pc-40, but I'm keeping it in case I have to get inside a 7' tall door to dig.
Jim